As a graduate of Fannie Farmer's School of Cookery, Charlotte Gregory is thrilled to have the opportunity to travel, lecture, and give cooking demonstrations on the very latest kitchen revolution--the gas stove. And she certainly doesn't mind that the gas company has hired the kindhearted Lewis Mathis to entertain at her lectures.

Lewis encourages Charlotte's work, especially her crusade to introduce fresh, appetizing, nutritious food to those convalescing in hospitals. But young hospital superintendent Dr. Joel Brooks is not convinced any changes should be made--especially by this outspoken young woman.

Determined to make it, three sisters promise to help each other in life and love! Working the telephone switchboard as a "hello girl," Hannah Gregory insists on reimbursing the charity of lawyer Lincoln Cole. After a run-in with the law, she's forced to accept his help, but When Love Calls, how will she answer?